Your problem is then having two different circuits in one box. I can't
remember if this is allowed. However, if it is allowed, a warning sticker
inside saying that several different circuits use the same accessory may be
a good idea. This might prevent someone turning off the lighting circuit and
getting fried from the ring main based lighting.
I'm not quite clear what you mean. If you mean having one switch in the
two gang from the lighting circuit and one from the 'ring' (after the
FCU), then this is ok - it's common to have two or more different circuits
in one switch enclosure in hallways.
I'd stick a note inside the box, though. ;-)
*Husband and cat lost -- reward for cat
Dave Plowman email@example.com London SW 12
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